The Harmonized Commodity Description and Coding System, also
known as the Harmonized System (HS) of tariff nomenclature is an
internationally-standardized system of names and numbers to
classify traded products. It came into effect in 1988 and has
since been developed and maintained by the World Customs
Organization (WCO) (formerly the Customs Co-operation Council),
an independent intergovernmental organization based in Brussels,
Belgium, with over 200 member countries.

There are 8~12 digit numbers of a full code. To ensure
harmonization, the contracting parties must employ at least
4-digit and 6-digit provisions, international rules and notes,
but are free to adopt additional subcategories and notes.

For example :

China joined the HS Harmonized System on January 1, 1992, at present, China
is using 10 digits HS code;

When the goods import into China Port, Before China Customs declaration,the most important first
step is goods HS classification,

Only after the goods HS classification, then can determine the below items for this commodity:

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